测定酶活性的必要条件是（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27523' and id < 2271041 and id<>'2271041' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27523' and id > 2271041 and id<>'2271041' order by id asc limit 5